title: Allopatric distribution and diversification without niche shift in a bryophyte-feeding basal moth lineage (Lepidoptera: Micropterigidae).
abstract: The Lepidoptera represent one of the most successful radiations of plant-feeding insects, which predominantly took place within angiosperms beginning in the Cretaceous period. Angiosperm colonization is thought to underlie the evolutionary success of the Lepidoptera because angiosperms provide an enormous range of niches for ecological speciation to take place. By contrast, the basal lepidopteran lineage, Micropterigidae, remained unassociated with angiosperms since Jurassic times but nevertheless achieved a modest diversity in the Japanese Archipelago. We explored the causes and processes of diversification of the Japanese micropterigid moths by performing molecular phylogenetic analysis and extensive ecological surveying. Phylogenetic analysis recovered a monophyletic group of approximately 25 East Asian endemic species that feed exclusively on the liverwort Conocephalum conicum, suggesting that niche shifts hardly played a role in their diversification. Consistent with the low flying ability of micropterigid moths, the distributions of the Conocephalum specialists are each localized and allopatric, indicating that speciation by geographical isolation has been the major process shaping the diversity of Japanese Micropterigidae. To our knowledge, this is the largest radiation of herbivorous insects that does not accompany any apparent niche differentiation. We suggest that the significance of non-ecological speciation during the diversification of the Lepidoptera is commonly underestimated.
authors.affiliation: Faculty of Science, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo, Kyoto 606-8502, Japan. y.imada@hx8.ecs.kyoto-u.ac.jp
authors.forename: Yume
authors.initials: Y
authors.lastname: Imada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kawakita
authors.forename: Makoto
authors.initials: M
authors.lastname: Kato
mesh_terms: D000818:Animals; D005075:Biological Evolution; D044002:Bryophyta; D002467:Cell Nucleus / Q000235:genetics; D017753:Ecosystem; D003576:Electron Transport Complex IV / Q000235:genetics; D005247:Feeding Behavior; D017344:Genes, Insect; D050259:Genes, Mitochondrial / Q000235:genetics; D049810:Genetic Speciation; D007564:Japan; D007814:Larva / Q000235:genetics / Q000254:growth & development / Q000502:physiology; D008969:Molecular Sequence Data; D009036:Moths / Q000235:genetics* / Q000254:growth & development / Q000502:physiology; D020648:Peptide Elongation Factor 1 / Q000235:genetics; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D016415:Sequence Alignment; D013045:Species Specificity
chemical_list: D020648:Peptide Elongation Factor 1; D012337:RNA, Ribosomal, 18S; D003576:Electron Transport Complex IV